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Long-Term Debt - Average Daily Excess Availability for Preceding Fiscal Quarter (Detail) | 12 Months Ended
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Dec. 31, 2017
Second Amendment to Credit Agreement [Member] | Level I [Member] |
Line Of Credit Facility [Line Items] |
Average Daily Availability | Greater than or equal to $100,000,000
LIBO Rate Applicable Margin | 1.25%
Base Rate Applicable Margin | 0.25%
Second Amendment to Credit Agreement [Member] | Level II [Member] |
Line Of Credit Facility [Line Items] |
Average Daily Availability | Less than $100,000,000 but greater than or equal to $40,000,000
LIBO Rate Applicable Margin | 1.50%
Base Rate Applicable Margin | 0.50%
Second Amendment to Credit Agreement [Member] | Level III [Member] |
Line Of Credit Facility [Line Items] |
Average Daily Availability | Less than $40,000,000
LIBO Rate Applicable Margin | 1.75%
Base Rate Applicable Margin | 0.75%
Third Amendment to Credit Agreement [Member] | Level I [Member] |
Line Of Credit Facility [Line Items] |
Average Daily Availability | Greater than or equal to $70,000,000
LIBO Rate Applicable Margin | 1.25%
Base Rate Applicable Margin | 0.25%
Third Amendment to Credit Agreement [Member] | Level II [Member] |
Line Of Credit Facility [Line Items] |
Average Daily Availability | Less than $70,000,000
LIBO Rate Applicable Margin | 1.375%
Base Rate Applicable Margin | 0.50%

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- Definition Applicable margin applied to the base rate. For these purposes, the base rate equals the prime rate. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Applicable margin applied to the LIBO rate. + References No definition available. + Details
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Namespace Prefix: | bgfv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Description of the conditions for borrowing under the credit facility including the nature of any restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Balance Type: |
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- Details
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- Details
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- Details
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- Details
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